The number of days each year that are suitable for disease transmission by mosquitoes is rising in much of the U.S., as temperatures climb with climate change. This can increase the risk of mosquito-borne diseases such as Zika and West Nile. Following research from Stanford University, Climate Central analyzed the number of days in the spring,

Hot and humid summer weather across the U.S. brings with it the rise of the mosquito season, and this year the threat of the Zika virus makes that more than a minor nuisance. Mosquito species found in the Lower 48 states are known to transmit this disease, thriving in tropical and subtropical climates. As the climate warms and humidity increases